Typewriter



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Urrea' srarss i narran Terr r a HARRY BATES, 0F YORK, N. Y., ASSIGNOR, BY MESNE ASSGNMENTS, TO. ROCHES- TER INDUSTRIES, IN C., OF ROCHESTER, NEW YORK, A CORPORATION 0F NEW YORK.

TYPEWRITER.

Application led September?, 1920. Serial No. 407,765.

To all whom t may concern:

Be it known that I, HARRY BATES,- a citizen-of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Typewrters, of which the following is a specification.

This invention relates broadly to typewriters and more particularly to a portable machine.

The principal object of the present invention is to provide a typewriting machine capable of performing commercial work and wherein the mechanism is so compacted that the machine may be carried in a moderate sized overcoat pocket;

`Another object' of the present invention is the provision of a typewriting machine having a standard keyboard and adapted to perform typewriting of a general character with the mechanism compacted into a spa-ce slightly larger than an ordinary octavo book,`

A still further and important object of the present invention is a typewriting machine having a standard keyboard and endthrust type bars mounted directly over a portion of the key levers in such manner that the effective vertical height of the operat; ing mechanism is very small and with the machine mounted in a portable frame or case in which the machine frame is movable to provide clearance for operation of the key levers when the portable frame or case is set for permitting operation of the machine. y

Another and important object of the present invention is an exceedingly compact, small, typewriter having a standard keyboard with endwise slidable type bars mounted over the key levers and with a short opi erating lever connecting the type bars with the key leversin order to maintain the effective vertical height of the operating mechanism as small as is consistent with good practice in typewriter construction.

A still further and important object of the present invention is a small compact type-writing machine mechanism mounted in a portable frame provided with devices for -Other and further objects of the present invention will in part be pointed out hereinafter and will in part be obvious from the disclosure in the specification and drawings comprisingv a part of the present application and wherein like characters are used to represent like parts throughout the several figures thereof.

It is realized that the inventions in the typewriting machine herein disclosed may he embodied in constructions other than.

those specifically shown and described,`so therefore it.is desired that the disclosure herewith shall be understood as being illustrative and not to be considered in the limiting sense.

Figure l is a perspective view of a complete typewriting machne in accordance with the present inventions and showing a port-able frame or carrying case open with a portion of the lid portion out away; l

Figure 2 is a plan view of the machine frame with the carriage, the cover for the type bars, and the ribbon spools, removed;

Figure 3 is a plan view of the bottom of the machine frame removed from the portable frame and with the carriage removed from the machine frame;

Figure 4 is a small detail perspective showing an elevation of the back of the machine frame with the carriage removed;

Figure 5 is a detail plan view of a single key lever and type bar illustrating the type bar mechanism;

soA

Figure 6 is a detail elevational view illusl trating the type bar shown in Figure 5 in -its retracted position;

on line 8-8 and showing three type bars and operating mechanism;

Figure 9 is a plan view of the machine frame and illustrating the platen shift mechanism;

Figure 10 is an elevational detail view of the platen shift mechanism with the platen in raised position; taken on line 10-10-of Figure 9;

Figure 11 is a view similar to Figure 10 illustrating the platen shift mechanism operated to lower the carriage to intermediate position; v

Figure 12 is a view similar to F lgure 11 with the carriage in its lowermost position;

Figure 13 is a perspective view of the carriage with the platen removed;

Figure 14 is a plan View of the mechanism for operating the feed dogs;

Figure 15 is a detailview of the feed dogs in engagement with the rack;

Figure 16 is a detail view of the feed dogs disengaged with the rack;

Figure 17 illustrates the operation of the universal bar by the space bar or the key lever;

Figure 18 is a detail view illustrating the folding space bar in normal position;

Figure 19 is a detail illustrating the space bar in folded position;

Figure 2O illustrates in enlarged scale the escapement mechanism operated by the space bar to release the carriage feed;

Figure 21 is a detail view of the carriage release mechanism mounted on the carriage;

Figure 22 is an enlarged view of the operating button construction of the carriage release bar;

Figure 23 is an elevational front view of the carriage with a part broken away illustrating the marginal stop mechanism and showing the lock for holding the carriage in central position on the carriage bed;

Figure 24 illustrates the right-hand marginal stop arranged in inoperative position to render the stop ineffective whereby the carriage may be moved to the leftand removed from the carriage bed;

Figure 25 illustrates the righthand marginal stop in position to be effective as a marginal stop;

Figure 26 is a plan view of the carriage illustrating both marginal stops and the central plate with which the stops c0- operate;

Figure 27 is a sectional view in enlarged scale through the platen and paper-feed mechanism and illustrating the paperffeed, apron, roll, etc.;

Figure 28 is a detail perspective view showing the line-space ratchet-wheel and the paper-feed roll together with the springs for forcing the paper-feed roll against the platen;

Figure 29 isa detail 'view of the mounting for a paper finger; on section line 29-29 of Figure 27;

Figure 30 is a perspective view ofthe paper finger;

Figure 31 illustrates an end plate of the platen frame;

Figure 32 is a plan View showing the ribbon operating mechanism;

Figure 33 is an elevational sectional view of the ribbon operating mechanism taken on line 33-33 of Figure 32;

Figure 34 isf'a manner in which the ribbon feeddogs are controlled;

Figure 35 is a detail view of one ribbon spool illustrating the connected parts;

detail View illustrating the Figure 36 is a detail perspective view showing the securing means used in place of cotter pins;

Figure 37 is-a sectional View illustrating the pin shown in Figure 36;

Figure 38 is an elevational view illustrat- \ing the mechanism by means of which the machine frame is raised or lowered in the portable frame and showing the machine frame in its lowermost osition;

Figure 39 is a. view slmilar to Fi re 38 showing the machine frame in its ralsed pof sition;

Figure 40 is a view illustrating the preferred form of the raising and 'lowering mechanism for the machine frame and showing the amount of movement of the frame;

Figure 41 is a skeletonized perspective the mechanism in order to reduce the vert tical height of the` package to be carried. In this type of machine it is necessary that an abnormal number of joints be provided between workiing parts which ordinaril should bey-maintained rigid and the resu t is that there is liability of the joints becoming weakened or lessened so that stability is lost, and this is especially true where machine parts are folded. Another 't e of portable machine has comprised mere y reducing the size and lightening the'weight of operating parts. Such machines are really semi-portable and are not intended to' i be, nor are they adapted for being carried' Manara n about as articles of general portability. A. Other features and objects of the type third t pe of portable machine has oombar mechanism will become obvious by furprised ey-wheel t pes of machines having ther analysis thereof with reference to Figcondensed keyboardswhich are not standard pres 2, 3, 5, 46, 7 and 8 wherein a type bar 1 and which are not adapted for use in a is illustrated as provided with three typegeneral commercial way. There have also faces 2 on one end thereof and an operating een constructed and used various types lever slot 4. in the' other end thereof. of toy typewriters which are more or less The type bai' is preferably .formed of portable, but such typewriters,'however, are metal having considerable strength such as not at present under consideration iii view an alloy of steel, or the like, and therefore' of the fact that the present invention is` the bar may be out as at 5 to leave longitudidevoted to a commercially useful machine. nal ribs 6 that extend substantially back of The typewriting machine embodying the and reinforce the type faces. This provides inventions which will hereinafter be more a strong and at the same time light type bar speciically described, overcomes the difculwhich is an element in providino` a quick ties of the known prior art by combining a snappy action. The upper edge of the type standard keyboard with a recognized combars may be provided with longitudinal marcial type System, and wherein the astongues 7 and the lower edge adjacent the sociated mechanisms of the machine are conslot 4 preferably is provided with dependstructedand adapted 'to perform commer- 111g tOligues 8. These depending tongues excial work by an voperator trained to operate tend pn one side of the type bar so that the the ordinary commercial types of standard remaining portion of the bar may comprise typewriters. The particular embodiment of a shoulder 9 which forms a support on which the present inventions is associated with, the t pe bar-may slide over the radial slots and comprises an end-thrust type bar 10 1g. 2) in the movement of the type bar mechanism wherein the type bar is of very from rest to printing position. Radial slots short length and is capable of a short quick 10 are provided in the segment base plate 11, action, with the type bar mounted iny a which preferably is 'hardened metal such as very small arced segment and having the an alloy of steel, or the like, adapted to operating mechanism of the type bars comstand the wear and at the same time provide pacted into a very small vertical space. a Smooth friction surface over which the This compact arrangement is mounted in a type bars may slide. The upper edges of machine frame which preferably is secured the type. bars are guided by the tongue 7 within a portable frame or carrying case which slides between projections 12, which with devices provided for lifting the mamay be screws provided in the removable chine frame relatively to the portable frame top plate 14 or the projections may be struck when the carrying case is opened to renfrom'this top plate as is illustrated in the der the machine operative. drawings. This top plate 14 may be covered by the cover plate and preferabl a felt pad 13 or similar material is placed between the The principal object of the bar mechanism topplate and the cover plate. The top plate of the present invention is that of providing pre erably is provided with openings 23 a sho-rt length type bar with a very com- Which are located over the type bars. Prefpact operating leverage mechanism so that erably a segmental rebound cushion 15 is the bars may be associated in a very short, provided back of the type bars and against Smau Segment, j which the bars normally rest. Both the pad A further object of the bar mechanism 13 and the pad 15 preferably are oil soaked is the provision of type bars constructed to to the proper degree whereby the oil from be guided radially of the segment throughthese pads is released by operation of the out the length of the bar during the beginmachine to oil the type bar and other operning of the stroke and Whereas at the end ating parts. The front end of the segmental of the stroke only the type ends and the base plate 11 is provided with V-shaped opera-ting ends of the barslare controlled guides 16 (Figs. 2, 4 and 5) located adjaby suitable guides. cent the aligning post 17 which is provided 'A still further object accomplished by with'notches 18 and 19 (Fig. 4) that exactly the bar operating mechanism, is a type bar fit the aligning lugs 20 and 21 (Fig. 6) on of relatively thin metal with a shoulder on the type bars so that when a type bar is the lower edge of the bar and tongues exdriven to printing position the bar is rigtending from the shoulder into a radial ldly held by the notches 18 and 19 against guide slot with an actuating lever extending both vertical and lateral movement so that through the same slot and operating on the each type bar is accurately positioned at the type bar in the plane of movement of the moment of printing. Therefore it becomes bar in such manner as to conserve space beunnecessary to guide the intermediate portween adjacent bars and to apply the forces tion of the type bar after it has been started in the line of movement of the bar. forward in a direct horizontal line in the di- Bar mechanism.

rection of its length. The type bar tends to move like an arrow and consequently goes straight to the printing point where the alignin features operate as specified to produce su stantially perfect alignment and all the momentum of the moving bar may be utilized for printing impact.

Each type bar is provided with an operating lever 22 which has a slotted pivot opening 24 so that the operating levers may be clipped over a segmental plvot wire 25 which lies above the lever spacincr comb 26 that guides the operating levers ad'acent the pivot points. Each operating lever has a disk-shaped head 27, that operates in the slot:

4 in'thetype bar and provides a line driving contact between the type bar and the actuating lever. A link 28 connects the operating lever 22 with the key lever 29 in such manner that the movement of the oint of connection between the link and tie operating lever is a circular movement when the key lever is depressed and with the parts arranged so that the effective leverage of-the link on the operating lever is substantially maximum for the normal position of the key lever and which decreases as the key-lever descends. This construction produces an acceleration of the type bar when the key lever is depressed so that the movement of the disk head 0n the key lever may be likenwed to the movement of a stone or. weight in a sling. This produces a quick easy action whichgreatly contributes to Speed of operation ofthe machine. The rearends 30 of the key levers are slotted and are hooked over the key lever pivot rod 31 where a movable back plate 32 maintains the key levers in position in the rod. The metal from which the key levers are formed is of such thickness that no spacing is required between individual key levers so that the levers are automatically maintained against lateral movement after the levers are positioned over the pivot rod 31. The forward ends of the key levers extend through the front guide' comb 34, which is substantially a straight slotted bar extending across the machine frame. Preferably the key levers fan out (Fig. 3) from the pivot wire 31 so that the pull on `the links 28 is substantially a vertical pull in the plane of the swing of-the levers, thereby avoiding side 'stress on the several pivot bearings. The front ends of the key levers carry the usual finger keys 35.

Return springs 36 are secured to the operating levers 22 above the pivot wire 25 and preferably extend upwardly whereby the upper ends of the springs are anchored in a segmental rib 37. The effective pull of the springs on the operating levers is somewhat in the direction of the length of the levers, when the parts are in normal position,so that the resistance of the s rings to the key lever action is least whent e key lever is in normal position. Consequently the pull of the spring is not appreciated by the operator in starting-to depress a key lever. As

the operating lever moves forward and the parts gain in momentum, thereturn springs 3G are stretched until the momentum of the moving parts is absorbed by the type impact in printing. As soon as the momentum is absorbed the action of the spring becomes effective to quickly return the parts to normal position. This action is rendered more effective due 'to the fact that the effective pull of the spring on the operating lever is greatest when the type bar is ator near the printing point. This arrangement of parts takes advantage of the absorption of momentum in the printing'impact, ofthe rebound ot the type bar from. the platen, and of4 the maximum effective eilicieney of the return springs, to provide an exceedingly quick, positively accelerated return.

From the foregoing it will appear that the parts have been constructed with the connections arranged in such manner as to provide a very quick movement in throwing the type bar to the printing point and an equally quickmovement in returning a type bar to normal position.

Oase shift and cawz'age mechanism.

The' mechanism about to be analyzed is to provide a construction simple in operation and rigid in form for causing relative movement between the platen and the path of travel of the different groups of types in such manner as to enable the printing to be shifted from one group of type to another.

In the present machine, embodying endthrust type bars, relative movement preferably is occasioned by moving the platen while maintaining the path' of the type xed, so that the upper, the middle, or the lower groups of types may be selectively chosen as the operative group.

More specially the case shift mechanism comprises a carriage forming a guide for movement of the platen and paper feed mechanism relatively to the path of the type bars. The position of the platen is determined by stops, certain of which may have a movement relative to others of the stops in order to provide for selective positioning of the platen as specified.

Preferably the selective movement is accomplished by key levers 'so positioned as to be capable of operation by a single finger so that the desired shift may be obtained by a minimum mental effort on the part of the operator.

teferring now more particularly to Figures 9, 10, 1l and 12 'of the drawings, the machine frame 101, which preferably is made of pressed sheet steel, aluminum, or other material having suitable strength and lightprincipal object of the case shift' sov ness, carries a platen supporting shaft 102 which is securely mounted in the machine frame by means of stub-screws 104. This shaft 102 is provided with arms 105 and 106,'

with the arm 106 adjacent the left side of the machine frame being extended to form a level.' to which the shift key lever 107 is connected by means of a U-shaped link 108. The shift-key lever extends over a stub screw mounting 109 and is open on the under side for the purposes which will later be explained. A channel bar 110 is pivoted between the forward ends of the arms 105 and.106. The carriage frame 111 is mounted over channel bar 110 and is provided with outstanding flanges 112 and 114 on which the carriage slides. The flange 112 at the back of the carriage extends into a groove comprising the rear carriage runway 115 and the forward flange 114 sets upon a suitable supporting plate (see Fig. 2) 116 and slides beneath the retaining plate 117.

A The carriage is provided in each end with vertical slots 118 in which the end guideplate 119 of the platen frame 120 is adapted to slide vertically. An L-shaped bar 121 extends from beneath the platen frame 120 and fits within the channel bar 110 so that any vertical movement in the channel bar raises or lowers the platen frame in the carriage. The L-shaped bar 121 has the same longitudinal movement in the channel bar 110 that the flanges 112 and 114 have in their respective guideways. 'An L-shaped finger 122 is adapted to extend over the path of vertical movement of the channel bar 110 and to comprise the stop limiting the upward movement of the channel bar, whereby the printing point on the platen is in the path of the uppermost type on the type bars. A coiled spring 124 is coiled around the platen supporting shaft 102 with one end anchored to the frame 101, and the other end to the arm 106, with the spring acting to normally turn the platen shaft to lift the channel bar 110 against the L-shaped stop 122. This normally holds the platen in raised position so that the upper group of type are normally effective for printing.

The lever arm v106 is provided with an outstanding lug or stud 125, a block 126 mounted on the longitudinally movable bar 127 is guided by the post 123, and is normally positioned beneath the stud 125 so that the normal depression 'of the shiftkey lever turns the platen shaft 102 until the stud 125 engages the block 126. This position determines the intermediate position of the platen so that the middle group of type will be aligned with the printing point on the platen. (See Fig. 11.) A selective key lever 128 is ivoted on the stub screw mounting 109 an this key lever is provided with a segmental finger key 129 which encircles a portion of the shift- .a depression of the shift-key lever.

key button 130 so that a single finger may be positioned on the shift key and extend over the edge thereof sufciently to depress the selective key lever simultaneously with Such a movement causes theflongitudinally movab'le bar 127 to move endwise, thereby moving the block 126 from beneath the stud 125 so that the supporting shaft 102 may be further turned to continue the downward movement of the platen. An adjustable stud screw 131 is mounted in the bracket 132 on the machine frame and is held` in position by a small check nut 134. The upper end of this stub screw 131 contacts with the stud 125 and thereby limits the depression of the platen so that the lower group of type are rendered efl'ective to print, when the stud 125 contacts with the stub screw 131. The key lever 107 and the selective key lever 128 are both open beneath the stub screw mounting 109 in order to permit a yielding of these parts when pressure is brought in a vertical direction upon the platen and without tripping the key levers. It will be remembered that the present shift key mechanism is adapted for use in a typewrlting machine which sets in a portable carrying frame or case with the machine frame setting directly on the portable frame when the machine is compacted to be carried. The portable frame may comprise a hinged lid which in closing may contact with the platen and if the platen is forced downwardly by closing of the lid, the shift key levers resting on the portable frame would not be able to tip so therefore since the under parts of the levers are open over the pivots the levers may rise from their pivotal mount thereby obvating any danger of straining the parts.

The carriage mechanism is so closely associated with the case shift mechanism that these two groups will be described under the same general heading.

Referring now more specially to Figures 2, 10, 13 and 27, the carriage mechanism comprises a carriage frame 111 provided with the outstanding flanges 112 and 114, specified, adapted to support and guide the carriage in the runways on the machine frame 101 with flange 112V in the rear runway 115, and flange 114 sliding on the supporting plate 116 and held in position by the retaining plate 117 The ends of these flanges are connected by the carriage frame end plates which are provided with vertical slots 118 that guide the end guide-plates 119 on the platen frame 120, and the depending L-shaped bar 121 on the platen frame is slidable in the channel bar 110. Preferably theparts described are pressed sheet steel or similar material having suHicient strength and rigidity so that the carriage mechanism is exceedingly simple, light and strong. The

` carriage is limited in its endwise movementsby marginal stops which will be later described and upon proper adjustment of these stops, the carriage may be removed Vfrom the 6 earria e bed so that carriages and platens easily vinter- Oarrz'age fegd.

`1Y0 'l The principal object of the carriage feed mechanism of the Y resent linvention is to provide a feed whic is exceedingly simple and which is positive in action so that the necessity for spring drums is obviated and with the feed so constructed that during feedin movement the carriage may be entirely ree to be positioned as desired.

Another object of the carriage feed 1n accordance with the present invention is a construction wherein the return spring for the connected feed parts is so constructed as to cause positive feeding movement of the carriage on the return stroke of the arts with the eil'ective force of the spring eing applied to the carriage. rack in the direction of its length under conditions which the spring and wherein the letter feed Inovement is positively stopped by one ef the feed dogs, so that immediately after printing the carriage is locked.

Another important object of the present invention is to provide a carriage feed mechanism wherein the carriage is unlocked prior to type impact at the printing point and is relocked after the printing has occurred with the feed movement taking place just after printing.

Referring more specially to Figures 14 to 20 inclusive, the universal bar 201 is pivoted on studs 202 mounted on the machine frame 101 about the lower middle part thereof. The front guide comb 34 is provided with an overhanging ledge 204 to which coil springs 205 that are carried by the universal bar 201, are anchored. These springs exert a direct lifting action on the universal bar thereby maintaining the universal bar beneath the key levers 29 and beneath the space bar levers 206. These space bar levers are connected at their forward ends by a folding space bar 207 which is pivoted at 208 to the levers 206. The ends (Figs. 18 and 19) of the levers 206 are provided with shoulders 209 against which a stop plate 210 is adapted to rest when the space bar is down in normal position as shown in Figure 18. The stop plate 210 is adapted to contact with the upper side of the space bar levers 206 when the space bar 207 is raised to vertical, or folded position in order to shorten the length of the machine to more compactly fit it into a portable frame. 65

The universal bar 201 adjacent the pivot ermit the maximum effectiveness ofv therefor is provided with lips'tanding arms 211 and 212, and the arm 211 is connected by a link 213 with a bell crank 214 which is pivoted on the bracket 132 that is attached to the main frame 101. A locking dog 215 is pivoted at 216 to the back wall of the main frame 101 and this locking dog 215 is substantially a bell crank havin one arm 217 connected by link 218 to the ell crank 214. Ihe other arm or end of the locking dog 215 is provided with a nose 219 which is adapted to fit into the teeth of the rack 220 which is {ixedly mounted on the carriage frame 111. The feeding dog 221 is'pivoted as at 222 to the locking do 215 above the pivot 216. The forward en of the feed dog 221 is provided with a feeding nose 224 which is also adapted to engage the teeth of the rack 220. The opposite end of the feeding ,dog 221 is provided with a tail 225 which 1s adapted to engage and slide upon the plate 226, mounted on the machine frame, when the locking dog is released from thc rack. A wire or fiat spring 227 engages the feeding dog 221 adjacent the nose thereof and normally tends to urge the nose of thc do between the teeth of the rack 220.

ssuming the dogs to be in the position shown in Figure 15 and the key levers as shown in full lines Fig. 17, then supposing the key lever to be depressed to occupy the dotted line position inl Figure 17, the universal bar and connected parts will operate the feed dogs to cause the locking dog, to strike the stop plate 226 and the tail 225 of the feeding dog to slide on this plate 226 thereby removing the nose l224of the feeding dog of the rack, thus leaving the rack momentarily free. This action takes place as a type -bar moves to theprinting point and also when the space bar isv depressed. The spacebar is normally held suspended by coil springs 228, so that it does not drop when .-a' printing key lever is depressed. After printing has been accomplished and thepress'ure is released on the key button. the springs 205 lift the universalbar and cause vthe feeding dogs to move in the direction of the arrows A and B inFigure 20. It will be noted that the arrow A indicating the path of the feeding nose 224 is shorter than the arrow B and is more in the direction of the length of the rack. It therefore follows that the longitudinal movement of the feeding nose 224 advances the rack in the direction of the arrow() a proper feed-A ing interval before thc locking nose 219 enters the rack teeth. At the conclusion of the movement (dotted lines Fig. 20) it will be noted that both do engage the rack and rigidly hold the rmiE against longitudinal movement.

From the foregoing it will be clear the feeding mechanism is exceedingly simple, s1ight,.st1ong and effective,

Oaw'z'age release.

The principal object of the carriage release mechanism is the provision of a simple, efficient construction adapted to release the carriage from the action of the carriage feed dogs in order to permit the carriage to be positioned at the will of the operator.

The present invention contemplates two distinct mechanisms by means of which the release may be effected, one comprising a construction mounted upon the carriage and the other comprising the feeding mechanism previously described wherein the carriage may be released by holding down the space bar.

Referring more specially to Figures 13, 20, 21 and 22, the release bar 301 is mounted adjacent the rack 220 for vertical sliding movement parallel to the side of the rack and in direction which the rack teeth extend. The release bar is provided with diagonal slots 302 through which extend stationary pins 304 that are secured to the rack. A push rod 305 is secured to one end of the rclease bar and extends through a slot 306 in the end of the carriage frame. The end of the push rod carries a push button 307. A sliding washer 303 rests against the end of the carriage frame over the slot 306 and a compression spring 808 extends between the washer and the punsh button. When the washer and the push button. Then the arrow D the parts assume the position indicated in dotted lines in Figures 2l and 22 wherein the push arm has moved diagonally in a longitudinal and downward direction. The ends of the noses 119 and 224 on the feed dogs are sufficiently broad to extend beyond the rack in a sidewisc direction to be in the path of the release bar 301 when occupying the dotted line position specified, so that both dogs are pushed from position between the rack teeth, as shown in Figure f 21, thereby releasing the feed dogs frein the rack and permitting the carriage to be freely movable in an endwise direction within the limits of travel determined by the marginal stops.

By referring to Figures 17 and 20 it will be noted that when the space bar 207 or a key lever 29 is depressed the feeding dogs are disengaged from the rack. If it is desired the space bar 207 may be held in depressed position by one hand while thecarriage may be. freely moved with the opposite hand. within the limits above specified, and when so operated the space bar and connected parts become a release mechanism which is independent of the mechanism operated by the push button` The release mechanisms previously described are of exceeding slmpliclty ande-arriage release may be effected either from the key board or-from the carriage in the manner` specified.

Margin stops.

The principal object of the margin stops devices of the present invention is to provide an effective, sim le, marginal stop construction which may he utilized for limiting the carriage travel and unlocking or releasing the carriage so that it may be removed from the carriage bed as may be desired. Another object of the presentl invention is a marginal stop capable of being operatet'l to center the carriage on the machine frame when it is desired to larrange'the machine in the portable frame or case so that the carriage will automatically be positioned and held in such manner as to maintain the parts within the smallest width of the machine.

Referring more specially to Figures 23, 24 and 25 the carriage frame 111 carrying the platen frame 120 is slidably mounted on the machine frame 101 in such manner that the forward portion of the carriage frame travels beneath the sto plate 401 (see also Figures 2 and 4). T e left-hand end of the carriage frame carries a stop 402 which may be movable for adjustment as is desired but in order to maintain simplicity this stop preferably is anchored on the carriage frame as is indicated in Figures 23 and 26. It therefore follows that the travel of the carriage in a right-hand direction is stopped When the marginal stop 402 contacts with the edge of the stop plate 401. A pivot block 404 may also be movable on the carriage frame, but preferably is pivoted to the carriage frame as at 405 and this pivot block carries a flexible member 406 which may comprise a flexible wire or the like. A pair of stop pins 407 and 408 are provided adjacent the support of the pivot block which may comprise the right-hand end of the carriage frame and the flexible member 406 carries a stop head 409 which extends upwardly adjacent the stop 407 and 40S. When the flexible member 406 is positioned above the stop pin 407 the hook end 410 of the member 406 which extends through an opening 411 in the flange 112 bears against the trackway in .the main frame 101. The carriage is moved along until the hook end reaches the opening 412 in the supporting plate 116, when the hook drops into this opening. This locks the carriage centrally of the main frame so that the main frame may be quickly positioned in a suitable portable frame, and a lid or other support folded over the machine.

When the flexible member 406 is positioned between the stop pins 407 and 408 (Figure 25) the stop head is securely held in a position to strike a stop plate 401 when 

